Method of surface finishing of metal



1934- o. F. GOTTLIEB ET AL 1,934,527

METHOD OF SURFACE FINISHING OF METAL Original-Filed Sept. 2, 1932 J F5 :71 E Oacar c7 621651165.

Patented Dec. 18, 1934 PATENT o rriicsj 1,984,527 METHOD or SURFACE FINISHING or ETAL Y Oscar F. Gottlicb and Ray kegan, 111., assignors to ration, North Chicago,

Michigan Original application 631,446. Divided 1 Claim.

This invention relates to amethod of surface finishing of metal, and. will be described as applied to the surface finishing of plain metal surfaces, although it may be likewise applied to various shaped surfaces Without departing from the principle of the invention.

An object of this invention is the provision of a novel method of finishing the surface of an article, by which it becomes highly ornamented.

Another object is the provision of such a method including the association of abraded areas in such a manner that certain of the areas are partially eclipsed by certain of the other areas whereby a novel ornamentation in a variety of designs may be produced.

The present application is a division of applicants co-pending application, Serial No. 631,446, filed September 2, 1932.

Other objects and advantages of this invention will become apparent to those skilled in the art, from the following detail description with reference to the accompanying drawing.

On the drawing:

Figure 1 is a fragmentary plan view of a portion of a machine illustrated in detail in the application of which this is a division, this figure illustrating a moving table and a portion of the support therefor.

Figures 2, 3, 4 and 5 illustrate the successive steps in the method of finishing an article of manufacture and as hereinafter set forth in detail.

As shown on the drawing:

One mechanism whereby the improved method may be carried out is illustrated fragmentarily and partially diagrammatically in Figure 1. The mechanism herein illustrated comprises a normally rigid support 6 having mounted thereon a horizontally movable carriage or table support '7 upon which is pivotally mounted, as at 10, a rotatable table 8. The table 8 is suitably adapted for receiving thereon a plurality of metal articles 9, such as automotive instrument panels, with surfaces to be ornamented.

Numeral 11 designates generally the fragmentary showing of controlling devices for horizontally moving the carriage 7 and for holding it in various adjusted positions. Numeral 12 has reference to a series of circles which diagrammatically represent a series of rotary abrading devices which are capable of producing ornamentation upon the areas bounded by circles designated by numeral 15 in Figure 2. The finishing elements or abrading devices represented by circles 12 are preferably arranged in align- Al Sandberg, Wan- Oakes Products Corpo- Ill., a corporation of September 2, 1932, Serial No. and this application June 12, 1933, Serial No. 675,378

ment and spaced a distance less than the diameter of the circles 15. The circles 15 represent the position taken by the finishing elements relatively to the plate 9 which is to be finished, when the abrading devices are once applied to the surface to be finished. The circles 16 in Figure 3 represent the position taken by the abrading devices upon the second application of the abrading mechanism. The circles 16 or abraded areas 17 bounded by the circles 16 partially overlap or eclipse the abraded areas 14 bounded by the circles 15. This result is accomplished by progressively moving the carriage? to the left as shown in Figure 10, with the table 8 rigidly secured from rotation relative thereto and by holding the series of abrading devices in such a position that the line of extension of the finishing or abrading elements in a horizontal plane is disposed at an angle to the direction of movement of the carriage 7 in carrying the article 9 to be finished beneath' the finishing elements. Preferably, this angle is such that each succeeding element engages the article in a manner to operate upon or abrade a portion of the area which was previously finished by the preceding finishing element. This is best illustrated by Figures 2, 3, 4 and 5, the circles on which represent the boundaries of successively abraded areas 14, 17, 19 and 21, the respective circles being designated-by numerals 15, 16, 18 and 22. In Figure 4, a third series of abraded areas 19 is shown and in Figure 5 the fourth series of abraded areas is illustrated by numeral 21, which more completely illustrate the method of finishing the surface of an article, and indicate the resulting design.

In order to procure the effect of a multiplicity of partially eclipsed circular areas on the finished article, it is not necessary that the angle of extension of the seriesof finishing elements must be of a specified value relatively to the direction of movement of the carriage 7, as it will be understood that various angles and various amounts of movement of the carriages 7 between each finishing operation will determine the specific design. The angle employed and the extent of movement between operations will of necessity depend to some extent upon the size of the areas and the distance of spacing between the abrading devices. The finishing devices which have herein been described as abrading devices, may, if desired, be non-abrasive rotating elements, in which case abrasive material is preferably applied to the surface of the article to be finished, together with oil or the like prior to the application of the finishing elements. In carrying out the improved method of surface finishing of an article of manufacture, it is not necessary that the table 8 be held stationary, during the progressive movements of the carriage '7 along a rectilinear path, but the table 8 may be moved-angularly in any desired manner to vary the design within a wide range, without departing from the,

principle of the invention. It is desired, therefore, that the patent to be granted herein shall not be restricted in any manner except as necessitated by the prior art and. the scope of. the appended claim.

We claim as our invention:

Method of surface finishing an article to produce the effect of partially eclipsed areas on the article, which consists in imparting intermittent movement to the article and during the dwells subjecting a part of the article surface to abrasive action, and shifting the article in a plurality of directions to present angularly different portions of the article surface to abrasive action in such wise that every abrasive area in- 10 .cludes a portion of an adjacent area.

OSCAR F. GO'I'TLIEB. RAY A. SANDBERG. 

